RealBand and PowerTracks allow you to use wav files along side midi files. If you have the wav file just add it.
If you don’t have the wave file any free wave editor like Audacity can be used to record one. Or you can use either RB or PT to record it.
If you want to make a bank of wav’s then Kontakt 3.5 may be what you need. It’s a bit on the expensive side but it comes with a ton of excellent patches.
I’m not saying let’s go kill all the stupid people. I’m just saying let’s remove all the warning labels and let the problem sort itself out.